Cisco Firewall :: Internet In ASA 5505 With Static PAT
Aug 31, 2012
I have an ASA 5505 behind my internet router. i have got only one public ip configured on the router outside interface.192.168.20.0/24 subnet is configured between ASA and router and inside network is 192.168.10.0/24 (Refer the attached diagram).
I have exposed my mail server and ftp server to public through static PAT in router and ASA with the same public on router outside interface. Iam facing issue some of the machines inside my network internet is not working(actually DNS is not resolving) some of the PC's internet is working fine some of the PC's randomly working. i have attached the diagram and ASA config , after this issue is sorted out i need to configure a L2L VPN to my head office.
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Feb 5, 2012
I'm trying to configure a second server on my network but whenever I add the static NAT rule, the internet stops working on that computer.
Here's my Cisco ASA configuration:
ASA Version 7.2(3)
!
hostname domain
[Code].....
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May 26, 2011
I just replaced a PIX 501 with a new ASA5505. I had a very weird problem and would like to know what caused it incase I run into it again. The setup is a DSL connection, with an old-ish speedstream DSL modem. Static IP, no PPPoE. I had a PIX 501, then two servers with static NAT entries on secondary WAN IPs. Everything was working fine on the PIX, I just duplicated the config over to the ASA. I swapped out the PIX for the ASA, and rebooted the DSL modem to clear out it's cache. After installation, NAT was working fine for the the global pool, but the systems with static NAT could not get online. I tried lots of different things to fix them, and they never worked. Finally I rememberd running into an issue like this a long time ago, in that the static NAT IP's wouldn't work without giving them a bump-start on the network. So I assigned the ASA each of my WAN IPs, one at a time, and tested them all. After that I went back to the original WAN IP, configured the static NATs, and they fired right up. why did my static NAT entries not work until I first assigned them to the ASA, then swapped back? I did reset the DSL modem when I swapped the firewalls, so I don't believe it was an ARP issue (unless it was an ARP issue at the far end?) I would like to know if there is something I can do differently with the devices or with the config to not have this issue again in the future.
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May 25, 2011
Currently a customer has all theLAN devices using a router as the Default Gateway. The router also do the Dynamic NAT to the internet access and has NAT/PAT rules to publish some services like HTTP and FTP. As I know the router will permit all the incoming traffic in all its interfaces without restrictions at less there is an ACLs that restrict the incoming traffic on an specific interface.Now the customer has bought a brand new ASA and wants to use it as the default gateway for the entiery LAN. This means, the ASA will have the internet connection and will be the responsible for the NAT/PAT process.
I have configured the NAT/PAT rules already following the current router configuration, but I need to know if I have to configure ACLs allowing the incoming traffic on th Outside interface for the services I NATed.
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Jan 12, 2012
I have a Cisco ASA5505 running 8.2(1) and I am using ASDM to manage the firewall. I have a Linux VPN server on the inside with and IP address of YYY.YYY.YYY.39 with a static NAT to the outside with an address of XXX.XXX.XXX.171 . I have a site to site VPN tunnel which terminates on the outside of the ASA on the outside interface XXX.XXX.XXX.190 .Traffic from the YYY.YYY.YYY.0/24 network can't transverse the site to site VPN as there is a conflict of IP address's on the far side so it is natted via a dynamic policy to host address ZZZ.ZZZ.ZZZ.100, Users remote into the inside(YYY.YYY.YYY.0/24) for support via the Linux VPN server (.39) and then need to communicate down the site to site VPN. The problem is that the static NAT for the incomming connections takes preference and bypasses the site to site VPN tunnel for outbound traffic. I tried to create a policy Static nat but it tries to modify the static nat that handels the incomming traffic to the Linux server.
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Jan 28, 2013
i have 2 internal server sitting in inside interface
inside network vlan 1 ip address 192.168.0.20, and 192.168.0.22
i going to map 192.168.0.20 to public ip routable address 203.117.124.180 and 192.168.0.22 to public ip routable address 203.117.124.181
the purpose is to make those 2 server 192.168.0.20, and .22 to be able to access remotely using public routable ip address,
however, after done the configuration i still not able to ping or access the public IP Address mention above. my both server are turn on and can access internally.both server are also able to access internet. See below partial configuration retrieve from Show Run.
nat-control
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
nat (Antlab) 1 0.0.0.0 0.0.0.0
[Code].....
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Aug 30, 2011
I have a 5505 for a small business that has one web server. The web server has a static NAT entry to an IP address and not an interface. There is an access rule allowing any HTTP traffic to the outside IP of the web server. From the web server I can't access the Internet.
All other computers on the network can access the Internet using a dynamic nat rule that uses the outside interface. The web server is accessible from a computer behind the firewall.
If I delete the static NAT entry for the web server I can get on the Internet.
I have turned debugging on and see that an outbound connection is built and then 30 seconds later the connection is torn down with the bytes 0 SYN Timeout message.
I am running 8.0(5).
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Feb 9, 2013
I have configured the ASA in a very similar manner to how the PIX was set up but I'm having trouble with some hosts on the inside accessing the Internet. Any inside hosts which use DHCP work fine. Any inside hosts with a static IP (and configured on the ASA with a "static" rule) cannot access the Internet. For example, in the config below the server daviker-dialler cannot access the Internet. I've spent a few days working on this now and have started from scratch several times but I'm not getting anywhere. Apologies for all the X's everywhere, didn't like to post anything sensitive on the Internet.
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Jun 3, 2013
I am mapping static ip address to the local ip address.We have a bsnl broadband connection, and bsnl has provided us with one static ip address.We are using broadband modem.Now I would liket to map this static ip address to one of the private ip address which is 192.168.1.2(database server).i want to do nat above ips if i do so then i dont have no ip to assign to my outside interface.I would like to access this device over internet, by typing my public (Static ip ) given by the BSNL.security device i have is cisco ASA 5505.
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Jun 10, 2011
I am setting up a Cisco ASA 5505 first time for My organisation, I usually setup Cisco Router, I have 10 Static IP, & Have 6 Server (S-1, S-2, S-3, S-4, S-5, S-6), Traffic Should be pass through the ASA and is distributed to the destination server that is specified in the packet. LAN servers can be separated into discrete networks for security. For example, a private LAN for internal traffic accessed only via remote dial-in VPN sessions and Want to Configure DMZ for Server (S-4, S-5, S-6) that allows public web traffic.
I have Attached My Network Diagram I have some question,
1:- Can we Configure Multiple Static IP On ASA 5505 ?
2:- If Diagram is wrong what change need to be done ?
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Feb 3, 2013
I have ASA 5505 with basic licence, v9.1, ASDM 7.1. I want to create the DMZ for a web server.
The interface 0 is for the outside network The interface 6 is for the DMZ All other interfaces are for the inside network
My ISP provided me with one public static IP address, one gateway address and a subnet mask 255.255.255.252
1/ I would like to ask which interface I should assign the public static IP address to. Should it be assigned to the outside interface 0, or should it be assigned to the DMZ interface 6, while outside interface would be configured to use DHCP?
I tried to assign the static IP address to the outside interface first, but then when I used ASDM the “Public Servers” feature to configure NAT, I get error message that the outside interface and the public address cannot have the same IP address.
2/ For the sake of peace of mind, I am thinking about using the second firewall, which would be used only for the inside network. Can I connect this second firewall to one of the inside interfaces of the 1st firewall,
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Mar 22, 2012
I have created a simple static ip address by using this command:
interface Vlan1
nameif inside
security-level 100
[Code].....
But, no matter what, the I can't ping the static address or access the computer 10.2.1.2 from outside of the asa 5505. I have attempted to ping from inside of the asa 5505 or from another computer. I just does not work.
I also have created several rules that allows icmp traffic.
icmp unreachable rate-limit 1 burst-size 1
icmp permit any echo-reply inside
icmp permit 10.2.1.0 255.255.255.0 inside
icmp permit any echo-reply outside
icmp permit any outside
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Jan 2, 2013
I've having a problem with our company ASA5505 router.
We recently moved to a new adress, so everything had to be set up again. I have a static IP, submask and gateway from our new ISP. The router have been factory reset before moving. We have betweeen 10-20 employees on our LAN in the office. In an attempt to make things easier I have changed the internal IP (and IP range) to 10.0.200.1 with a range from 10.0.200.5 - 10.0.200.100 as our NAS/printer/plotter have IPs within this range.
I can ping machines on the internal IPs and in ASDM the Outside interface is show as "up" with a green arrow. But there still isn't any internet connection. The only thing I haven't tried (because people need the current network to be online) is changing "route inside 0.0.0.0 0.0.0.0 62.242.X.X 1" to "route outside 0.0.0.0 0.0.0.0 62.242.X.X 1"
I have recieved a primary and secondary DNS adress as well, but I'm in doubt as to were I'm supposed to enter these (Using ASDM Version 6.3). I would like everything "Behind" the router to be run by DHCP.
Here is the running config:
ASA Version 8.2(2)
!
hostname ciscoasa
[Code].....
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Mar 20, 2012
I just upgraded my firewall to ASA 5505. Now, my original static ip address cofiguration is gone. Apperantly, Cisco went away from static ip address to something like nat (inside,outside) dynamic interface. how to create a static ip address under version 8.4? By the way, I am sharing what my configuration used to look before upgrading.
!
hostname cisco-asa
domain-name default.domain.invalid
names
!
interface Vlan1
nameif inside
security-level 100
[code].....
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Feb 23, 2013
I was checking out the config on my ASA and noticed a bunch of static routes configured when I did a show route. With the exception of two that I expect to be there, the remainder point traffic destined for specific internal hosts to the outside interface, i.e.
S private_ip 255.255.255.255 [1/0] via public_ip, outside
I verified that I cannot ping those hosts from the firewall. I logged in to the ASDM. When I check the Configuration>Device Setup>Routing>Static Routes it only shows two static routes, the ones I expect to see. If I look under Monitoring>Routing>Routes, I see the same output as I did on the CLI. I looked around to see if I was missing a key location for this information, and I was able to see the same static routes output in Monitoring>Routing>Routes. Since this is under monitoring though there's no way to delete these routes, and I still don't know where they were configured originally. Then I happened to check under Monitoring>VPN>VPN Statistics>Sessions, and I see several of the private IPs used in the static routes being used by VPN users, including my own! I know I didn't assign myself a static IP for VPN use or anything like that. So, what are these static IP routes? Why do I see them in the CLI and not under the Configuration tab? I mean, I know I can delete them from the CLI but I'm trying to figure out why the info is not synced. Am I seeing dynamically created content based on the VPN connections?
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Mar 17, 2012
working config with least amount of code for:
IOS post 8.3
Subnet: 192.168.1.0 /24
Static NAT (from any source) to server 192.168.1.100 and allow the same incoming connections on outside interface
Ports:
TCP 20,21
TCP 80
UDP 50000-50020
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Sep 20, 2012
I have been using static NAT to map between a single server behind an ASA 5505 and a single public IP address. In other words, I've been doing this:
object network NAT_ME
nat (inside,outside) static interface
Now I would like to start using the clientless VPN feature of the ASA, so I of course don't want that particular port forwarded to the server. Is there a way to define such an exclusion? I've tried several things, including setting up a separate NAT rule to direct that port back to the ASA's interface, without luck.
If that is not possible, what configuration would I need to move to in order to get the behavior that I want? It is important that all (non-VPN) traffic is passed exactly as it arrives at the firewall (whether it is coming from internal or external), with the exception of changing the IP address (i.e., I need static port mappings for some of my services).
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Aug 15, 2012
I am having difficulty following the logic of the port-translation. Here is the configuration on a 5505 with 8.3,So I would have thought the outside access-list should reference the 'mapped' port but even with 3398 open I cannot remote desktop to the host. If I open 3389 then I can connect successfully.
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Aug 23, 2011
setting up an ASA 5505 to be used as a firewall between a BT internet router(BTNet service) and a Cisco 3560 Lan switch. BT have presented me with a cisco 3800 series router with the following details:
Network Address Network Mask BTnet NTE Router LAN Address
There are 2 Gigethernet ports on the back of the router port Ge0/0 is connected to the BT NTE and the status light is flashing green. Int ge0/1 is connected into port int e0/1 of the ASA but i am unable to get any connection.
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Apr 1, 2013
I am trying to configure DMZ on ASA 5505, basic license. After changes I have made I cannot access Internet from DMZ. I think I am missing an access list for DMZ, but I am not sure.
interface Ethernet0/0switchport access vlan 2!interface Ethernet0/1 !interface Ethernet0/2!interface Ethernet0/3!interface Ethernet0/4!interface Ethernet0/5switchport access vlan 3!interface Ethernet0/6!interface
[Code].....
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Jun 2, 2011
I have basically started fresh, from a clean image. We bought these with the expectation that we would be able to configure them using the GUI for what we need, which up till this point doesn’t seem to be the case.I will tell you how I have this setup, I have our ADSL going to a modem acting as a bridge with a static IP supplied by the ISP. If i connect a laptop to that modem and set the static ip on the laptop, I get internet access fine.So I then connect the modem to ethernet0/0 and the laptop to ethernet 0/1 I connect to the ASDM and run the startup wizard with the following:
· Outside ip : 87.87.87.87 255.255.252.0 (this works on the lappy straight to the modem)
· Inside ip : 192.168.10.1 255.255.255.0
· No dmz
[code]......
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Dec 27, 2011
First time attempting to set up a 5505. Trying to replace a snapgear firewall and replicate the settings to the 5505.
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Sep 6, 2011
I have a 5505 ver 8.2 connected to a router with a T1 internet connection. There was a problem with the internet service and when it was resolved the ASA did not pass traffic to the internet until it was power-cycled. Unfortunately that's all the info I have, as I was not onsite and couldn't access the ASA.
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Dec 11, 2012
I am using ASA 5505.Below are my sh run.I am not able to ping my gatway i.e 182.73.131.89
interface Ethernet0/0
description Internet Interface
switchport access vlan 61
!
interface Ethernet0/1
description office Internet
switchport access vlan 50
[code]....
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Apr 1, 2013
I have not been having much success configuring my 5505 for Internet access, and I'm sure there are a few small things I'm missing. At times I believe I got it to the point where I could ping, but still not pass through the Internet traffic. At this point, I reset the 5505 and only changed a couple of settings. I have an external range with these characteristics: Network Address 67.139.113.16 (.17 is Gateway), SM: 255.255.255.248, available IP: 67.139.113.218 The external connection is through a T1 modem, and when I put those settings in my laptop, I can access just fine. When I went through the startup wizard in the ADSM, I maded the internal interface 10.209.0.3, subnet mask: 255.255.255.0 I selected PAT in the Wizard, but don't know if I should have, or if the NAT rules I tried to put in are fine. Eventually I want to add a Site to Site VPN to the rest of the 10.0.0.0 network, but I can't even pass the Internet through to the inside. Also, this will eventually be behind another hosted firewall, so I'm not worried about restricting access, even currently. However, I suspect the problem is that traffic is being blocked with the NAT rules or Access rules.I wish I could just disable those inherent deny rules Outside of pings to 10.209.0.3, all pings come back as request timed out.
Config:
: Saved
:
ASA Version 8.2(5)
!
[Code].....
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Jun 17, 2012
I am trying to configure Nat on a clean ASA 5505, but can't get it to work. I ran the commands below. On the ASA I can ping the internet and inside vlan ip. On my laptop I can ping the ASA inside vlan ip, but I can't ping the outside vlan ip. From another network I can ping the ASA outside public ip. Is there an access-list that denies inside from accessing outside?
I am running version 8.4(3) and I erased the existing configuration.
ASA(config)# interface vlan 1
ASA(config-if)# ip address 10.0.0.1 255.255.255.0
ASA(config-if)# nameif inside
[Code].....
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Dec 4, 2012
I want to access my ASA 5505 from internet.how I can achieve it.
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Aug 11, 2012
I have a Cisco ASA 5505 that has been configured to act as a router as well. I have configured 3 VLANS that have access to the internet. For some reason the "InsideWifi" and the "Guest" VLANS have very slow internet speeds and sometime web pages wont finish loading properly. The "Inside" VLAN gets the speeds that are expected. The DNS server does reside on the "Inside" VLAN. Is there anything wrong with my configuration that would cause the internet speeds on the other VLANS to be slow? My config is attached.
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Jun 18, 2012
We currently use a linux software based firewall called IPCop that sits between our network and router (This is in bridged mode) IPCop conects over PPPoE and everything works fine.
However the system is not reliable and I fear not that secure so have purchased an ASA5505 now I have added the PPPoE info to the device using the ADSM software however although it picks up my external static IP I'm unable to access the internet. On IPCop I only had to enter the broadband credentials and it worked however I feel like I may have to add more to the Cisco, for example do I have to specify DNS servers and do I have to set a static route?
Here is my config file so far (Note I think I have turned on the ability to ping from internal to external). My config I have done through the ADSM as opposed to the CLI
: Saved:ASA Version 8.4(3) !hostname ciscoasaenable password 8Ry2YjIyt7RRXU24 encryptedpasswd 2KFQnbNIdI.2KYOU encryptednames!interface Ethernet0/0switchport access vlan 2!interface Ethernet0/1!interface
[Code].....
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May 24, 2011
I'm trying to allow SSH traffic from the Internet to my DMZ. I gave my remote guy my ip and he can see the ASA 5505 but not get into the DMZ. The outside is 70.165.19.137. The DMZ server is 192.168.60.2. I have the inside talking to the DMZ fine. [code]
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Aug 9, 2012
I recently bought an ASA on eBay the plan was to try and learn how to configure them and get more familar with Cisco's ASA hardware etc.
I want it to do the routing for my home network. The way things are setup at the moment is pretty standard. I have an ADSL modem which is also a router which was provided by my ISP (Orange).
The first thing I did was change the router to be in "modem only" mode which seems to have worked. I then got the ASA to use PPPOE by following this guide [URL] I assume that worked as it is authenticating with the ISP and I'm getting a puplic IP address assigned to the outside interface. The default gateway is being set by the "ip address pppoe set route" command which I have verified with the "show route" command. The problem I'm having is that even though I'm getting a public IP I can't ping any thing from the ASA I've pinged 8.8.8.8 and 4.4.4.2 using the outside interface as the source but I'm not getting any responce. I have tried changing the MTU a few times to different amounts on the outside interface with no luck.
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Feb 27, 2011
I set up an ASA 5505 at home through PPPOE connection. The ASA seems to obtain an IP address correctly.and I can ping a public ip address using the outside nic, but not the inside nic. I saw the error message when I ping: No route to ff0213 from fe801bc2b1288cd5bc1. As a result, I cannot connect to the Internet.
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Aug 22, 2011
Trying to connect a 5505 with a dynamic address on 8.3(2) to a static IP'd asa (5510 on 8.2(1) with a DefaultL2LGroup and dynamic maps already created.
Inside networks:
Local (5505) 192.168.100.0 /24
Remote (5510) 10.100.1.0 /24
Configuration on 5505
isakmp policy 20 authentication pre-share isakmp policy 20 encryption 3des isakmp policy 20 hash md5 isakmp policy 20 group 2 isakmp policy 20 lifetime 3600 isakmp enable outside access-list 100 extended permit ip 192.168.100.0 255.255.255.0 10.100.1.0 255.255.255.0nat (inside,any) 0 access-list 100tunnel-group DefaultL2LGroup ipsec-attributes pre-shared-key *****crypto ipsec transform-set myset esp-3des esp-md5-hmac crypto dynamic-map cisco 1 set transform-set myset crypto map dyn-map 20 ipsec-isakmp dynamic cisco crypto map dyn-map interface outside
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